In my career met a number of people from both professions who had failed one and been very successful in the other. Some who couldn't make ATCO went on to be excellent pilots, including becoming training captains with major airlines. Equally, I have worked with excellent ATCOs who had failed miserably at Hamble.
Unfortunately, aptitude tests are all the rage now; luckily they weren't when I was starting or I would not have stood a chance.
Good luck and I hope you achieve your dream.